Sea Temperature in Kotka in September

© Владимир Боков

Complete information on the sea temperature range in the Gulf of Finland in Kotka in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Kotka. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Kotka Climate and Swimming Opportunities in September

Kotka lies within the Southern Finland Province in Finland. The average daytime temperature in Kotka in September is 14°C (57°F), while the nighttime average is 6°C (43°F). There are typically 11 rainy days during the month, with a total precipitation of 57 mm (2.2 inches). The daylight duration in September in Kotka is 13 hours, with an average of 4 hours of sunshine per day. The average wind speed in September is 9 km/h (6 mph), and the humidity level is around 86%.

The water temperature in Kotka in September ranges from 12°C to 17°C (54°F to 63°F). At the beginning of the month, the average temperature is around 17°C (63°F), shifting to 15°C (59°F) by mid-September and reaching 13°C (55°F) in the last ten days. Overall, the average sea temperature in Kotka for September is 15°C (59°F). The water is cool, but many swimmers can tolerate it, especially with the sun out. Acclimatization is helpful.

Frequently Asked Questions About Water Temperatures in September in Kotka